2 Knix Evolution bras NWT equivalent to 36"

I have two never opened bags with Knix Evolution bras. They are size 3 which size guide says fits 36B, C and D plus 38B. I bought 3 and opened one but it's too small. I wore it 3 or 4 times and washed it as described but while it stretched some but it is still too small for me. It should fit a size 36 fine but not a 38. These bras are made to be snug and loosen with wear. Bras are reversible from black to beige and come with beige straps that can be switched with black straps. they sell for $56 each. I will sell two for $50 and throw in the third, very gently used bra as well.